EP0348381B1 - Verbundstahlwerkstück und Verfahren zu seiner Herstellung - Google Patents

Verbundstahlwerkstück und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0348381B1
EP0348381B1 EP89890164A EP89890164A EP0348381B1 EP 0348381 B1 EP0348381 B1 EP 0348381B1 EP 89890164 A EP89890164 A EP 89890164A EP 89890164 A EP89890164 A EP 89890164A EP 0348381 B1 EP0348381 B1 EP 0348381B1
Authority
EP
European Patent Office
Prior art keywords
core
carrier sleeve
cross
section
recess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89890164A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0348381A2 (de
EP0348381A3 (de
Inventor
Walter Kroisenbrunner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine Boehler Edelstahl GmbH
Original Assignee
Boehler Edelstahl GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boehler Edelstahl GmbH filed Critical Boehler Edelstahl GmbH
Publication of EP0348381A2 publication Critical patent/EP0348381A2/de
Publication of EP0348381A3 publication Critical patent/EP0348381A3/de
Application granted granted Critical
Publication of EP0348381B1 publication Critical patent/EP0348381B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/04—Shaping in the rough solely by forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B29C48/6801—Barrels or cylinders characterised by the material or their manufacturing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B29C48/682—Barrels or cylinders for twin screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B21B2001/383—Cladded or coated products
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12292—Workpiece with longitudinal passageway or stopweld material [e.g., for tubular stock, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12958—Next to Fe-base component
    • Y10T428/12965—Both containing 0.01-1.7% carbon [i.e., steel]

Definitions

  • the invention relates to a composite steel workpiece or a machine part with at least one longitudinally extending recess comprising a support sleeve, preferably cylindrically shaped at least over part of its outer surface, and a wear and / or corrosion-resistant lining which delimits the recess (s) along its circumference, which are under Training an eg by pressing, rolling or the like. manufactured metal composite or a metallic bond is (are) connected to the carrier sleeve.
  • the invention further relates to a method for producing such composite steel workpieces.
  • the aim of the invention is to provide an easy-to-carry out method for producing composite steel workpieces which are corrosion and / or wear-resistant on the inside and which meet all the requirements placed on them during operation.
  • the composite workpieces should meet the demands placed on them in practice and still have the necessary strength.
  • Such composite workpieces or machine parts are subject to very high wear due to the internal pressures resulting in the range of 1000 to 2000 bar, the often high corrosion stress and not least due to the fillers commonly used in plastics processing, for example. It has been shown that certain fillers, such as glass fibers, can reduce the service life of these parts to 1/10 of the original value. Especially since around 0.25 mm is considered the maximum permissible play between the screw and the cylinder in injection molding machines, one can measure the importance of the wear factor and the machine manufacturers have accordingly made great efforts to solve this technical problem.
  • EP-A-0052092 discloses a method for producing lined hollow machine cylinders, in which a cylindrical steel core and a tube of the same type are deformed together to form a metallic bond between the core and the sleeve. A hole is then made centrally in the core.
  • the maintenance of circular cross-sectional shapes and the axial symmetry of the core and the cladding tube with only the longitudinal extension of the material or the blank are important requirements.
  • a superimposed torsion which may occur during each deformation step, can be disregarded.
  • the recess formed in the composite steel workpiece has a cross-sectional shape deviating from a circular shape, for example the shape of two overlapping circles, and in that the metal composite surface between the lining which also deviates from a circular shape and the carrier sleeve has different normal distances along its circumference from the peripheral surface of the carrier sleeve, it being alternatively possible that the circular recess formed in the composite steel workpiece is arranged eccentrically with respect to the center of the carrier sleeve and the metal composite surface between the lining, which also has a circular shape, and the carrier sleeve along its circumference, different normal distances from the peripheral surface of the carrier Owl owns.
  • a method according to EP-A-0052092 is characterized according to the invention in that, in particular for the formation of a double or multiple screw cylinder made of composite steel for plastics processing at the point (s) of the desired recess (s) in the machine part, the blank with at least one Provide the core and, together with the core (s), is subjected to a deformation at a higher temperature, in particular a reduction in cross-section, in which the core (s) in a carrier sleeve is given a cross-sectional shape deviating from a circular shape or, alternatively, a circular core shows a position which is eccentric with respect to the center of the carrier sleeve or has different distances with respect to the peripheral surface of the carrier sleeve, and that the recess (s) are (are) formed in the core (s).
  • FIGS. 1a, 1b, 1c and FIGS. 2a and 2b and FIGS. 3a and 3c show different stages of the manufacturing process or different composite steel workpieces in section; 4 and 5 show different starting workpieces and end products in section and FIG. 6 shows schematically a plant for carrying out the method according to the invention.
  • the method according to the invention is based on the production of a blank with a production of a carrier sleeve which is provided with a core, whereupon the carrier sleeve provided with the core is subjected to a reduction in cross section at elevated temperature in order to achieve a metal bond between the core and the carrier sleeve.
  • a hole (or several holes) is drilled or machined into a metal bar or a metal profile as a carrier sleeve, into which one or more metal rod (s) as the core (s) are inserted in an exactly fitting manner.
  • the ends of the carrier sleeve are sealed airtight in order to avoid oxidation in the subsequent hot working and to produce the metal composite at the appropriate processing temperature, preferably about 10 ⁇ 0 ⁇ 0 ⁇ to 1260 ⁇ ° C.
  • Fig. 1a shows the section through a composite steel cylinder for plastics processing with a carrier sleeve 1 with an inserted two-part core 2 ', 3'.
  • This workpiece was produced by eccentrically drilling a hole in a cylindrical metal bar, then a core 3 'was inserted into this hole, and subsequently a further hole overlapping the hole was made.
  • the core 3 'and a further core 2' which were partially machined when the further bore was drilled, were cleaned (like with alcohol, trichlorethylene or the like) as well as the inner surface of the bore and reinserted in the bore. After closing the ends, e.g.
  • the material of the two cores also forms a metal composite in spite of the high carbon or possibly present carbide content.
  • a metal composite was produced between the cores, which led to a one-piece lining, which in turn is connected to a carrier sleeve 1 via a metal composite. Due to this structure, the stresses occurring in the hard carbon and / or carbide-rich lining material can be easily absorbed by the tough alloy material of the carrier sleeve 1 and cracks and cracks in the lining 4 can be avoided.
  • the deformation of the cores introduced into the carrier sleeve takes place at a corresponding temperature relatively uniformly and the cross-sectional shape of the cores is approximately or well maintained, so that in original, for example circular Cores circular holes can be introduced, which leave a lining 4 of substantially regular thickness. Due to the growing together of the core parts 2 ', 3', and the adaptation of the non-circular lining 4 to the non-circular shape of the lining 3, stresses due to the uneven thickness of the lining 4 are largely avoided or evenly transmitted to the carrier sleeve.
  • Fig. 2a shows a section through a rectangular support sleeve 1, in which a round core 2 is introduced in the middle.
  • a round core 2 is introduced in the middle.
  • the somewhat square cross section of the carrier sleeve shown in FIG. 2b is achieved with an elongated or oval or elliptically shaped core.
  • two overlapping holes are made and the recess 3 is made, as is e.g. is required to accommodate a twin screw for plastics processing.
  • Fig. 3a shows a cylindrical carrier sleeve 1, in which a round core 2 is inserted essentially concentrically. For example, by pressing at elevated temperature, the carrier sleeve is deformed into a cylinder that is flattened on both sides. Overlapping recesses 3 are drilled into the oval or elongated core, as shown in FIG. 3b. The composite steel workpiece shown in Fig. 3b can then be turned to the workpiece shown in Fig. 3c.
  • the workpieces are usually deformed or reduced in cross-section by forging, pressing or rolling at elevated temperatures. If a composite steel workpiece is to be forged as shown in FIG. 1 a, it is clamped in a manipulator 5, as shown in FIG. 6.
  • the manipulator 5 feeds the workpiece 1 to a long forging machine 6, from which it passes into another manipulator 7; the manipulators 5, 7 are used for guiding and further moving or rotating the workpiece during the long forging process.
  • the invention provides that the workpiece alternate with its Ends A and B of the long forging machine 6 are fed, ie the workpiece is rotated by 180 ° after each stitch and fed to the forge again, thus largely avoiding undesirable twisting of the core.
  • the individual stitches also run under the same conditions, in particular with the same feed or twisting.
  • the cross-sectional area or the degree of deformation can be varied in order to take into account the deformation or cross-sectional change that occurred in the previous stitch, in order to obtain actually identical deformations or cross-sectional changes in successive stitches.
  • Forging presses with upper and lower dies or double or multiple hammer forges with conical hammers or presses with conical dies are advantageously used.
  • a cross-sectional reduction by rolling is particularly suitable for the production of long composite steel workpieces.
  • FIG. 4 shows various starting forms of carrier sleeves 1 provided with cores 2 in the upper row and in the lower row various composite steel workpieces obtained after the reduction in cross section, into which recesses 3 are made, which are delimited by the remnants of the cores 2 as lining 4.
  • the composite steel workpiece according to FIG. 4 a shows two inserted cores, which were deformed into a square in the course of the deformation of the carrier sleeve 1, into which two independent or two overlapping recesses 3 were made.
  • the rectangular carrier sleeve according to Fig. 4b shows an essentially rectangular core 2.
  • an essentially rectangular recess 3 e.g. by spark erosion, incorporated into the core material.
  • the composite steel workpiece according to FIG. 4c shows a rectangular carrier sleeve 1, which uses an oval or elongated core has been; after drilling out three overlapping recesses 3, the workpiece shown was obtained.
  • the shape of the core introduced into the carrier sleeve 1 and also the type of cross-sectional reduction influence the shape of the lining of the recess (es) in the finished composite steel workpiece.
  • the circumference of the lining 4 is similar to the shape of the core 2, which was also shown in the composite steel workpiece according to FIGS. 4c and 4e, which changed from a rectangular or square shape to an octagonal Shape were reduced in cross section.
  • 5 shows a view of composite steel workpieces which have been produced with carrier sleeves 1 having a circular cross section.
  • 5a shows a carrier sleeve with a rectangular core, in which a rectangular recess 3 was formed after the metal composite had been deformed or produced.
  • the composite workpiece according to FIG. 5b was formed from a carrier sleeve 1, into which a circular core was introduced asymmetrically. After the cross-sectional reduction at elevated temperature and the drilling process, an asymmetrically lying, essentially circular recess 3 was obtained, which was surrounded by a lining 4. Additional recesses 8, but without lining, were subsequently made in the carrier sleeve 1.
  • the composite steel workpiece according to FIG. 5c was produced starting from an asymmetrically lying circular core; an asymmetrical reduction in cross-section of the carrier sleeve 1 resulted in an asymmetrical shape of the lining 4 in the core material recess 3.
  • the composite steel workpiece according to FIG. 5e comprises a carrier sleeve 1 with an inserted triangular core 2, into which recesses 3 have been made after being deformed.
  • the procedure is preferably such that first a bore is made, then a core is inserted into this bore, then the second Drilling is completed, and in this a core that complements the first partially machined core is inserted.
  • the first core must prevent twisting, e.g. secured with a fitting bore formed at the interface between the core and the carrier sleeve and the fitting bolt inserted and secured against displacement, e.g. through a hole formed at the interface with a screwed-in screw. Welding to secure the cores is not possible if one or more hardenable steels are used.
  • the cores Since drilling is carried out using drilling oil, the cores must be cleaned before the metal connection is formed, as must the inner surface of the carrier sleeve. In order to protect the cores from oxidation during the hot forming, the end faces of the composite steel workpieces are closed before the forming process.
  • the hot forging or pressing or rolling to produce the metal composite takes place at temperatures between 10 Wie0 ⁇ 0 ⁇ and 1260 ⁇ ° C, in particular between 1170 ⁇ and 1190 ⁇ ° C.
  • the possibility of varying the position of the core with respect to the center or the outer surface of the carrier sleeve is of particular importance if the finished composite steel workpiece is e.g. mechanical processing is to be subjected to e.g. to be able to attach cooling, heating or holding devices for its intended use.
  • the possibility of fixing the core in any position with respect to the center point or the outer surface of the carrier sleeve and thus achieving directionally good strength properties of the composite steel cylinder was previously unknown or could not be produced due to the stresses occurring in the carrier sleeve and lining.
  • non-uniform recesses in particular recesses 3 deviating from a circular shape, with a relatively thin lining 4, which eliminates the risk of warping in the event of temperature changes and the risk of breakage of linings that are too thick or of areas of the linings that are too thick, as they are e.g. occur when an elongated recess would be made in a circular core.
  • the recesses 3 made in the composite steel workpieces can e.g. also have a cross-section which tapers conically in the longitudinal direction; this is achieved by e.g. introduces stepped holes, which are then tapered.
  • the carrier sleeve 1 is made from a blacksmith temperable alloy of high strength and toughness, for example structural steel or case-hardening steel, and the lining 4 is made of a forgeable and heat-treatable, preferably wear and / or corrosion-resistant alloy, for example ledeburitic chromium steel, preferably with at least 11% Cr, in particular at least 14% Cr and at least 1%, preferably at least 1.8 or 2.3% C, and when the carrier sleeve 1 with the lining 4 is deformed to form the metal composite between these alloys by reducing the cross section.
  • These steels each have the appropriate hardness and toughness in order to optimally support one another, in particular the formation of a metal bond between these alloys is also possible.
  • alloys can also be deformed well at certain temperatures and the composite piece produced can then be hardened well. It goes without saying that modifications of these types of alloys formed by adding one or more alloying elements can also be used, with Mo, V, W and Co in particular as additional elements for the ledeburitic Cr steels up to a total of about 12% and for the stainless Cr steels Mo, Ni, V, W, Co, Ti, Nb in particular can be mentioned up to a total of about 6%.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Forging (AREA)
  • Materials For Medical Uses (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Heat Treatment Of Steel (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP89890164A 1988-06-20 1989-06-15 Verbundstahlwerkstück und Verfahren zu seiner Herstellung Expired - Lifetime EP0348381B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1595/88 1988-06-20
AT0159588A AT393980B (de) 1988-06-20 1988-06-20 Verfahren zur herstellung von verbundstahlwerkstuecken und verbundstahlwerkstueck

Publications (3)

Publication Number Publication Date
EP0348381A2 EP0348381A2 (de) 1989-12-27
EP0348381A3 EP0348381A3 (de) 1991-01-16
EP0348381B1 true EP0348381B1 (de) 1993-11-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89890164A Expired - Lifetime EP0348381B1 (de) 1988-06-20 1989-06-15 Verbundstahlwerkstück und Verfahren zu seiner Herstellung

Country Status (11)

Country Link
US (1) US5093209A (no)
EP (1) EP0348381B1 (no)
JP (1) JPH0245119A (no)
KR (1) KR920007833B1 (no)
CN (1) CN1040339A (no)
AT (2) AT393980B (no)
AU (1) AU612268B2 (no)
DE (1) DE58906078D1 (no)
FI (1) FI893006A (no)
NO (1) NO892508L (no)
ZA (1) ZA894668B (no)

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CN103144265B (zh) * 2013-03-07 2017-05-31 上海逊达橡塑机械制造有限公司 一种挤出机的双金属筒体
CN103143897B (zh) * 2013-03-20 2016-01-20 沈阳飞机工业（集团）有限公司 细长窄条长桁防变形加工方法
CN103950181A (zh) * 2014-04-03 2014-07-30 于德胜 镶嵌高耐磨基材的锥双机筒
CN104607889B (zh) * 2015-01-13 2017-01-04 哈尔滨飞机工业集团有限责任公司 一种双曲面成型模工装的制造方法
CN108637598A (zh) * 2018-04-28 2018-10-12 王彩霞 哑铃、杠铃手柄抗氧化金属表面的制造方法
CN108819162A (zh) * 2018-05-18 2018-11-16 河北工业职业技术学院 一种双螺杆挤出机筒体内壁耐磨涂层的制备方法
CN108526830A (zh) * 2018-07-24 2018-09-14 东北大学 一种轴类件的复合制备工艺
CN111015125A (zh) * 2019-12-30 2020-04-17 成都康思达科技有限公司 铜球套装配工艺
CN115199686B (zh) * 2022-07-15 2023-10-20 杭州萧山红旗摩擦材料有限公司 工程车桥式高碳制动器摩擦片及加工工艺

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CH602330A5 (no) * 1976-08-26 1978-07-31 Bbc Brown Boveri & Cie
DE2752002C3 (de) * 1977-11-22 1980-09-11 Fa. Friedrich Theysohn, 3012 Langenhagen Verfahren zur Erzeugung einer verschleißfesten Schicht auf der inneren Oberfläche des Gehäuses eines Doppelschneckenextruders
DE2756422C2 (de) * 1977-12-17 1984-12-13 Walter Attnang-Puchheim Sticht Fertigungsanlage für in mehreren Schritten herzustellende Bauteile
DE2801499C3 (de) * 1978-01-11 1981-05-27 Siemens AG, 1000 Berlin und 8000 München Extruder zur Behandlung hochtemperaturempfindlicher Kunststoffe
AT379340B (de) * 1979-10-31 1985-12-27 Sticht Walter Einrichtung zur herstellung bzw. handhabung von werkstuecken
NL8003332A (nl) * 1980-06-06 1981-07-01 Wavin Bv Extruder-binnenbekleding.
AT368923B (de) * 1980-11-06 1982-11-25 Ver Edelstahlwerke Ag Verfahren zur herstellung von maschinenhohlzylindern
JPS60181208A (ja) * 1984-02-28 1985-09-14 Hitachi Metals Ltd プラスチツク成形機用多軸シリンダの製造法
DD225953A1 (de) * 1984-06-15 1985-08-14 Karl Marx Stadt Maschf Verschleissbestaendiger extruderzylinder, insbesondere fuer doppelschneckenextruder
JPS61154756A (ja) * 1984-12-27 1986-07-14 Hitachi Metals Ltd プラスチツク成形機用多孔シリンダの製造方法
JPS61216846A (ja) * 1985-03-20 1986-09-26 Hitachi Metals Ltd プラスチツク成形機用多孔シリンダの製造方法
EP0233437B1 (de) * 1986-02-21 1990-02-07 MANNESMANN Aktiengesellschaft Aus zwei Schichten bestehendes korrosionsbeständiges Rohr oder dergleichen Behälter
JPS63265617A (ja) * 1986-12-19 1988-11-02 Hitachi Metals Ltd 耐摩耗耐食性複合シリンダ
JPS63221025A (ja) * 1987-03-10 1988-09-14 Hitachi Metals Ltd 耐摩耗耐食性複合シリンダ
EP0399071B1 (en) * 1989-05-23 1995-08-02 Kubota Corporation Composite pipe having excellent corrosion resistance and mechanical properties to withstand high temperatures and high pressures

Also Published As

Publication number Publication date
ZA894668B (en) 1990-06-27
FI893006A0 (fi) 1989-06-19
AU612268B2 (en) 1991-07-04
KR900000137A (ko) 1990-01-30
CN1040339A (zh) 1990-03-14
NO892508D0 (no) 1989-06-16
FI893006A (fi) 1989-12-21
EP0348381A2 (de) 1989-12-27
JPH0245119A (ja) 1990-02-15
ATA159588A (de) 1991-07-15
DE58906078D1 (de) 1993-12-09
AU3666389A (en) 1990-04-12
KR920007833B1 (ko) 1992-09-18
EP0348381A3 (de) 1991-01-16
US5093209A (en) 1992-03-03
NO892508L (no) 1989-12-21
AT393980B (de) 1992-01-10
ATE96724T1 (de) 1993-11-15

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